Blower.



M. A. OOONNOR.

BLOWER.

APPLICATION FILED MAR.18,1907.*

Iatented Mar. 8, 1910.

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il li l llihill lo llllifll lilil Pl-h'l Elhl 'l MARTIN A. OCONhl'OR, Oli CHICAGO ILLINOIS.

BLOWER. l5

Specification of Letters Patent.

Application filed March 18 1907'.

minor,

Patontcd Mar; 8 r 19 Serial No. 362,918. a

To all whom it may comern:

Bo itlmown that I, li'lairrm A. (TCoNNon, a citizen of tho United States, residing in Chicago in the county of Cool: and State oi Illinois have invented a new and useful lm provcmcnt in Blowers, of which the followin is e specification.

lily im'ention relates to improvcments in blowers for converters, blast furnaccs and other purposes.

The object of my invention is to provide a positive pressure blower for supplying compressed air to Besscmcr converters blast furnaces, ac, Which'ivill be of a simple, etficient and durable construction and composed of low parts and by inc-ans oi which compressed air may be supnlicd with regularity ind uniformity in respect to volnmo and pressure, as requircd.

lily invention consists in the means 1 cm ploy to practically accomplish this object or result, as herein shown and described, the some comprising essentially a cylinder or shell fnrnished with inlet and outlet ports for the air, and a plurality of variable spccd air compressor blades or impellers rotating Witl'iin the shcll and rc'lerably about a oomn'ion'nxis, the impellers or blades altcr 5e13, a sproaching or overtaking each other to col the. air between them and e pol the compressed air through the outlet l'l. as the speed of the one accelerates over tho other and alternately receding or 7; from each other to admit fresh ween thorn through an inlet port. as good of the other blade in turn accclcrand that of the n'ientioned blade is 'l; anc' moans tor driving or rotatbladcs at variable or alternately ac l and retarded speeds such driving n2: preferably comprising two pairs oi.

ll crnicshingz ccccntrio o r non-circular gears roil-moi OlHJ or clli iiiicai gears. in up nos-ill: phase, the main driving shaft and tho other two being; one on cach ol the blade shat'ls.

it further consisls in two impcllcrs or compressor blades rotating about the same axis in a cylinder or shell, said impeller or blodcs alternately a 'nn'oaching and receding one from the other.

it further consists in combination with the cylinder or shell provided with inlet and outlcl ports, of impellers or compressor blodcs rotating in shell about a common l: '0 ol said gears being}; last on leave or approach them in rotation;

axis and alternately approaching re" ceding from each other to vary the volume between them and compress and cxpell the air the inlet and outlet ports of the cylinder or shell and the impellers orcolnpressor. 5;) blades being so couetructcd and combiiiodlas to cnable tho impellers or blades thrhselims lo upon and close the inlet andvoutlet ports at proper intervals, as said impeller-s orbladcs rotate and they alternately ilpproach oo and rucodc from each other.

The principle ol my invention onjbl ver is further to compress and displace th'e Inir or other gas by varying the volume-beta reen tho (ontinimusly rotating impellcrs or laides 'lo and the cylinder *all in SllUlLITl-tlllllfil that such volume will be a maximum 311st, asfthe admission port closes and a minimum-justas the discharge port closes, the ports inthe wall (bli the-cylinder being so situated rorrfi combined in relation to tho variablessp eed mechanism as to fulfil these conditiond the inlet and outlet ports being opened nnd closed by the impellers or .blades lasrthey ii 1l"80 Zvly invention further consists iir thc; novel constrimtion of parts and dcNicesa-nd in the novel continuation of parts and devices herein shown and described.

lo the accompanying drawing, form-lingo. 85 part of this specification, Figurelis a central vertical longitudinal section, partly in eleration, or a blower embodying my inven- Lion. Fig. 2 is a central horizontalsection, and l igs. 3, l, 5 and (i are vertical sections 90 of tho shell or cylinder showing thziit'om- 'or blades in different p0sili0ns,and the diagrams of the elliptic gears indifferent positions. Fig. 3 shows the position oftheimnollcrs just as the volume or air or gas has 95 hecn discharged and the discharge port closml by one impeller, While the other is inc osing another volume and closing the admis on port. Fig. 4- SllOWS the impellers pressor blades, each preferably of sectorshape, the arc of each sector being preferably about C C are rotating-shafts to which the .blades B B are secured respectively, the

shaft 0 being hollow, and the shaft C fitting within it, so that the blades rotate about a common axis. The shell or cylinder A is furnished with bearings a to receive the outer or hollow shaft C.

D is the driving shaft having a driving pulley D and F, F F F are non-circular gears, preferably oblong or elliptical gears, for rotating the air compressor blades at variable speeds, the speed of each blade being alternately accelerated and retarded so that the blades alternately approach each other and recede or separate from each other as they both rotate continuously around their common axis. Two of the gears Fl are secured to the driving shaft in, diametrically opposite positions, so that the one will be acting as a. gear of large diameter while the other is acting as a gear of small diameter. The elliptical or oblong ears F F are secured one to the blade shaft 0 and the other to the blade shaft C and mesh.

respectively with the gears F F on the driving shaft. As illustrated in the drawing the gears are arranged to turn one of the blades through five-sixths of a revolution while the other moves through one-sixth of a revolution. By increasing or diminishing the eccentricity or ellipticity or oblong character of the gears the relative acceleration and re tard-ation of the air compressor blades may be increased or diminished as required.

In operation, as indicated in Figs. 3, 4, 5 and 6, which represent the position of the blades and gears in four different successive positions, a quadrant apart, in 1* complete revolution,'l ig.;3 shows the secton-shaped blades B B in juxtaposition tlfe pne closing the air inlet and the other the air outlet port. Fig. 4 shows the sector-shaped blades B B diametrically opposite after the driving shaft. has made one-fdurth of a complete revolution, at which time the blade B has advanced five-twelfths of a revolution and the blade B one twelfth. Fig. 5 shows the position of the parts after the driving shaft has made a half revolution, at which time the blade B has advanced one-sixth of a revolu- .tion and the blade B five-sixths of a revo blade B advances one-twelfth of a revolution and the blade B five twelfths of a revolution, and the parts again assume their original position, as shown in Fig. 3, at which time both blades have made a complete revolution. The Fi s. 8, 4, 5 and 6, taken together, serx e to indicate how the rotative speed of the two blades B and B is alternately accelerated and retarded, and how the blades B B alternately approach and recede from each other. I

As' compared with the Roottype of blower for lower pressures, my invention or blower offers the following advantages: The cylinder and impellers are simple in form, being made of cylindrical and plane surfaces, and can be readily made with much greater accuracy than the cycloida-l surfaces of the old or Root type; second, larger displacement per revolution for a given volume of cylinder (as shown in the drawings the displacement is approximately, four thirds the volume of the cylinder per revolution) third, shorter leakage line and smaller clearance spaces, as all surfaces are plane or circular and can be made very accurately.

For higher pressures, which are usually obtained by the piston compressor or blowing engines, my invention or blower has the following advantages in its favorfirst there are no valves, cross head, connecting rod, etc. required; second, much less mass to be accelerated and retarded; third, greatly reduced friction losses, as there is less mechanism; and fourth, no packing as in the piston type as the clearance can be very small and the velocity great enough to make the leak age negligible.

In my invention the inlet and outlet ports A A are located closely adjacent to each other in the periphery of the cylinder or shell A and together occupy or extend over but a minor segment of the cylinder, preferably not much exceeding a quadrant thereof, so that the major segment of the cylinder is closed or without openings and thus made available for compressing the air between the sector shaped blades or impellers B B each of which is preferably a sectorof about sixty degrees or one sixth of the circumfer ence. This very greatly increases the compressive capacity of the blower for each complete revolution of the blades or impellers.

I claim:

1. The combination with a cylinder or shell having inlet and outlet ports both in a minor segment of its periphery and the major segment of itsperiphery being closed, of variable speed sector-shaped blades rotating continuously within the shell about a common axis, concentric shafts, one for each of said blades and intermeshing non-circular gears rotating the blades at alternately accelerated and retarded speeds, substantially as specified.

2. The combination with a cylinder having an inlet and outlet both in a minor segment of its periphery and the major se ment of i 115 perlphery benig closed, of varia )le speed i blades rotating continuously,within said cylinder. a driving shaft, a pair of oppositely arranged oblong gears on the driving shat't. said blades having eoneentrie Shafts and the shaft of eaeh 01' the blades having an oblong 1 gear meshing with one of the oblong gears on the driving shaft. snlmtantially as speeitied.

3. [n a eonnn'esmr or blo\\'er the eolnbh nation with a shell having adjaeent inlet; and outlet ports in a minor segment of its periphery and the major Segment" of its pei rip-hery being closed, of concentric shafts llllPCllQl'S rotating within the shell one secured to each of sald shafts, the one alter- E nat'el approaching and receding from the other to vary the volume between them, and nnwhanisin for rotating the blades e0ntinu- (lt! l and calmingone blade to approach into approximate eontaet and reeede from the other as they rotate substantially as specified.

' MARTIN A OCONNOR. \Vitnesses \Ynalnm A. (iin'nnt, l l. N. )IUNDY. 

